CR900/1180CH is a high plastic composite steel used in the automotive industry to manufacture structural parts requiring high strength and good formability. The steel’s composition and heat treatment process give it a high tensile strength of 900-1180 megapascals (MPa) and good elongation, making it suitable for forming complex shapes without cracking.
In the automotive industry, CR900/1180CH steel is commonly used for structural components such as door impact beams, B-pillars and roof rails, which must withstand high impact loads while maintaining their shape. Chosen for these applications because it allows manufacturers to produce parts with complex geometries while maintaining desired mechanical properties.
What kind of steel is CR900/1180CH? Is it cold rolled or hot rolled?
CR900/1180CH steel is a high-strength cold-rolled steel produced by a cold-rolling process, which means it is mainly a cold-rolled steel. “
During cold rolling, steel passes through a series of rolls at room temperature, reducing its thickness and improving its surface finish.
What are the characteristics of CR900/1180CH steel?
CR900/1180CH steel is a high-strength, high-plastic composite steel with excellent formability and weldability. Its main features include:
High strength: CR900/1180CH steel has a high tensile strength of 900-1180MPa, which is suitable for high-strength structural parts.
High ductility: This steel has high elongation and reduction of area, which means it can deform significantly before breaking. This makes it an excellent choice for parts that require a high degree of formability, such as automotive covers.
Excellent formability: CR900/1180CH steel has excellent formability and can be formed into complex parts with deep draws and sharp bends.
Improved crashworthiness: CR900/1180CH steel’s high strength and high ductility make it an excellent choice for parts requiring improved crashworthiness, such as automotive safety components.
Light weight: CR900/1180CH steel is light in weight, making it an ideal material for applications requiring high strength and light weight, such as automotive body structures.
What is the chemical composition of CR900/1180CH steel?
The chemical composition of CR900/1180CH steel usually includes:
Carbon (C): 0.08% max
Silicon (Si): 0.70% max
Manganese (Mn): 2.00% max
Phosphorus (P): 0.020% max
Sulfur (S): 0.010% max
Aluminum (Al): 0.015% minimum
Nitrogen (N): 0.0050% max
Chromium (Cr): 0.30% max
Copper (Cu): 0.30% max
The steel may also contain traces of other elements such as Nickel (Ni), Molybdenum (Mo) and Titanium (Ti).
What are the mechanical properties of CR900/1180CH steel?
CR900/1180CH steel is a high-strength composite steel with excellent mechanical properties. Its high yield strength and ultimate tensile strength make it suitable for applications requiring high strength and good formability.
The mechanical properties of CR900/1180CH steel generally include:
Yield strength: min 900 MPa
Tensile strength: 1180 MPa minimum
Elongation: 10% minimum
Uniform elongation: 5% minimum
Total Elongation: 20% minimum
Hardness: minimum 310 HV
These mechanical properties are generally considered sufficient for many applications. However, it is important to note that the specific requirements for mechanical properties will depend on the specific application and operating conditions. To ensure that the steel meets the specific requirements of the intended application.
What are the physical properties of CR900/1180CH steel?
C900/1180CH steel is a high-strength composite steel whose physical properties include:
Density: 7.85 g/cm3
Melting point: 1420-1460°C
Thermal Conductivity: 46.6 W/mK at 100°C
Coefficient of thermal expansion: 11.7×10^-6 /K
Specific heat capacity: 0.47 J/g°C
These properties are similar to other types of carbon steel, but the high strength of CR900/1180CH steel makes it ideal for applications requiring high strength and good formability.
What is the heat treatment process of CR900/1180CH steel?
CR900/1180CH steel is a high-strength high-plastic composite steel, which can be processed by conventional heat treatment methods. The heat treatment process of CR900/1180CH steel includes annealing, quenching and tempering.
Annealing: The purpose of annealing is to eliminate residual stress in the material and improve its machinability. The annealing temperature is generally between 720°C and 780°C, and the cooling rate is controlled at 10°C to 20°C per hour to avoid deformation.
Quenching: The purpose of quenching is to increase the strength and hardness of steel. The recommended quenching temperature of CR900/1180CH steel is between 850°C and 900°C, and the cooling rate is controlled at 10°C to 20°C per second to obtain a martensitic structure.
Tempering: The purpose of tempering is to reduce the brittleness of steel caused by quenching and improve its toughness. The tempering temperature of CR900/1180CH steel is generally between 500 and 650°C, and the holding time is determined by the thickness of the steel plate.
It is important to note that the heat treatment process parameters should be carefully controlled to ensure that the CR900/1180CH steel has the desired microstructure and mechanical properties.
What is the welding performance of CR900/1180CH steel?
CR900/1180CH steel is a high-strength composite steel whose weldability is affected by many factors, including the welding method, welding parameters, and the properties of the base metal and welding filler material.
Some general considerations for welding CR900/1180CH steel include:
Welding methods: CR900/1180CH steel can be welded using a variety of methods, including gas arc welding (GMAW), gas tungsten arc welding (GTAW), and resistance spot welding (RSW).
Welding parameters: Welding parameters for CR900/1180CH steel will depend on the specific welding method used, but in general, heat input should be kept low so as not to affect the strength and ductility of the material. Thicker sections may also need to be preheated.
What is the corrosion resistance of CR900/1180CH steel?
As a high strength steel, CR900/1180CH has moderate corrosion resistance. It is not considered a corrosion resistant steel and its corrosion resistance depends primarily on the coating or surface treatment applied to it. Without proper surface protection, the CR900/1180CH may be susceptible to corrosion, especially in harsh environments or when exposed to moisture and other corrosive substances. Therefore, proper coating or surface treatment must be used to protect the CR900/1180CH from corrosion.
What are the application cases of CR900/1180CH steel in automobiles?
CR900/1180CH steel is a high-strength, high-ductility steel that is ideal for a variety of automotive applications requiring high-strength, lightweight components. Here are some examples of how CR900/1180CH steel is used in automobiles:
Automotive Body Components: CR900/1180CH steel is commonly used in automotive body components such as side frames, B-pillars and roof rails. Its high strength and ductility allow for thinner and lighter components, improving fuel efficiency and reducing emissions.
Chassis components: CR900/1180CH steel is also used for chassis components such as suspension components, subframes and cross members. Its high strength and excellent fatigue resistance make it an ideal material for these applications requiring high durability and long service life.
Safety parts: CR900/1180CH steel is commonly used in safety parts such as door impact beams, bumper beams and side impact bars. Its high strength and excellent energy absorption capabilities make it an ideal material for these applications requiring high impact resistance and safety performance.